Adding machine



gwdg MNVENTOR @M H15 HTTORNEK Patented Oct. 7, 14924.

NITE!) STATES EDWIN R. KOESTER, 0F ERIE, PENNSYLVANIA.

ADDING MACHINE.

Application led J'une 28, 1920. Serial No. 392,392.

a part being broken l away to better show construction.

Fig. 2 a section on the line 2-2 in Fig. 1. 1 marks a base. This has a dial socket laarranged in its upper face. 2 is a mov.

able dial rotatively mounted inv the socket 1B, and 3 a stationary dial mounted on the base 1 and overlapping the movable dial. The movable dial has a series of numbered spaces4. These numbered spaces are in the form of elongated notches and the stationary dial 5' has a' series of numbered spaces corresponding to the spaces 4. The

stationary dial is provided with a stop 6 -at the zero position.

In using the machine the movable dial 2 is brought to the zero position, that is, with zero at the stop 6. Any implement, such as a lead pencil, is placed in the slot or notch 4 op osite the number on the stationary dial W 'ch it is desired to add. The movable dial is then carried forward until the pencil or implement engages the stop 6. The implement is then replaced in the notch opposite the number on the stationary' dial which'is the next number it is desired to add and thel movable dial is again moved .to the stop 6. This is repeated as often as the numbers are added and the sum will be indicated opposite the space 4 at the zero position, that is to say, if it is desired to .add 4, the pencil would be placed in the notch opposite the space numbered 4 on the stationary dial which is the notch opposite the numeral 4 on the movable dial and this would be carriedl to the zero position. If 9 is then to be added the pencil would be placed in the notch opposite the space 9 on the stationary dial which because of the fact that the movable dial had been moved forward tour spaces would be the space 13 and with the pencil in the notch opposite the space 9 themovable dial is carried forward to bring this notch to the zero position. 13 on the movable dial then would be at the zero position and would be the reading which would indicate the addition. This process may bev repeated as often as desired up to the number contained on the movable dial.

- In order to yieldingly1l hold'the movable dial in proper relation to the stationary dial and in adjusted position I prefer to provide a yielding detent mechanism for yieldingly holdin the movable 'dial in adjusted position. series of detents 7 corresponding to the spaces on the dial are carried on the periphery of the dial. A movable detent 8 is carried by the pin 9. The pin 9 has a head 10 which operates in a socket 11. A spring 12 is arranged in the socket vagainst the head 10 and yielding-ly crowds the detent 8 into engagement with the teeth or detents 7 so as to position the spaces on the movable dial opposite the spaces on the stationary dial and yieldingly holds the movable dial in adjusted position.

It may be desirable to give the machine a capacity above one hundred and this is accomplished by the following mechanism; A scroll 13 is formed on the bottom of the socket 1a. A block 14 is slidingly mounted in the slot 15 in the movable dial. It has projecting shoulders 16 which hold the block in position in the slot 15. A detent pin 17 operates in the scroll grooves 13. The detent iscarried by| a pin 18. The` pin 18 has a head 19 against which a spring 20 operates to yieldingly hold the detent pin 17 in the groove 13. The block 14 has a pointer 21 which operates over spaced numbers 22, the numbers 22being so spaced relatively to the scroll that the pointer will move from one to another with each revolu tion of the movable dial. It will readily be seen that as the movable dial passes the hundred marl: the hundreds will be indicated in the series of numbers 22.

1l't may be desirable to add more than one hundred in a single o eration, as for instance, 199. If this is desired the pencil is placed in the slot 9 toward the inner end of that notch and the length of the notch 4is such and so positioned relativel to the stop 6 that with the pencil at the inner end of the notch it Will pass the stop 6 and the dial may be completely rotated and on the second turn by moving the pencil to the o uter end n one end of the note of the notch it is arrested by the stop 6 at the completion of the movement. Similarly lany number up to the number of hundreds indicating `the capacity of the machine may be added.

I preferto provide a stop 23 which when the block 14 is moved to bring 'the pointer 21 to zero position will contact the stop' block 14 as the movable dial is rotated in a reverse direction. The groove of the scroll 13 is so shaped that the detent 17 can be readily moved radially in the slot and across the scrolls so as to bringl it into the last scroll at zero position and then with the necessary rotative movementin the backward direction the block can be brought immediately to the stop so that the device is completely re-set.

What I claim as new is 1. In an adding machine, the combination of a rotatingdial having numbered spaces,

with notches in the spaces; a stationary dial adjacent to the movable dial having corresponding numbered spaces; -and a stop adapted to engage an implement in the notches of the rotating dial at-the zero position of the stationary dial, said notches being elongated to ermlit an implement in li to clear the stop and in the other end of the notch to engage the stop.

2. In an addin machine, the combination of a rotating dia having numbered spaces; a stationary dial adjacent to the numbered dial having corresponding numbered spaces a scroll opposite the rotating dial; means sliding on said rotating dial and voprating in the scroll indicatin the number of rotations of the rotating dial, said means having a yieldingvengagement with .said scroll permitting the movement of said means radially by radial pressure to re-set the device; and a stop in the path of said means when moved to zero position whereby the' rotating disc may be set .at the zero position.

3. In an adding machine, the combination of a base having a scrol1 inn its face; a stationary dial on the base; a rotating dial operating in conjunction with the stationary 1 dial; a slot in the rotating dial; a device en! gaging the scroll and movable in the slot indicatin the number of rotations; and a stop i engage by said device for re-setting the dev vice at the zero position.v

In testimony whereof I have hereunto set.

m hand." i.

y EDWIN R. KQESTER. 

